CN102281669B - Mains supply light-emitting diode (LED) constant current driving circuit - Google Patents
Mains supply light-emitting diode (LED) constant current driving circuit Download PDFInfo
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- CN102281669B CN102281669B CN201110116198.6A CN201110116198A CN102281669B CN 102281669 B CN102281669 B CN 102281669B CN 201110116198 A CN201110116198 A CN 201110116198A CN 102281669 B CN102281669 B CN 102281669B
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Abstract
The invention discloses a mains supply light-emitting diode (LED) constant current driving circuit, which comprises an input and rectifier filter circuit, a switching control circuit, a constant current feedback control circuit and an output circuit, wherein an input is used as the input end of a rectifier filter circuit (1); the output end of the rectifier filter circuit (1) is connected with the input end of the switching control circuit (2); the output end of the switching control circuit (2) is connected with the input end of the constant current feedback control circuit (3); and the output end of the constant current feedback control circuit (3) is connected with the output circuit (4). The mains supply LED constant current driving circuit solves the problems that a special power supply is required and a driving circuit is large in volume, high in cost and the like in the conventional LED constant current driving technique, the voltage range of the mains supply LED constant current driving circuit is between 85 and 256V, and the mains supply LED constant current driving circuit is directly fed by a mains supply, is wide in application range, high in efficiency and simple in structure.
Description
Technical field
The present invention relates to a kind of constant-current source, be specifically related to a kind of commercial LED constant-current drive circuit, belong to field of power supplies.
Background technology
Due to LED(Light Emitting Diode, i.e. light-emitting diode) be the semiconductor device of characteristic sensitivity, there is again negative temperature characteristic, thereby in application process, need to stablize its operating state, thereby produced the concept driving.LED device is to the requirement of driving power near harshness, and it is low voltage drive, must design complicated translation circuit, and the LED lamp of different purposes, be equipped with different power supply adaptors.Along with the variation of the market demand, more and more higher to the requirement of the efficiency conversion of LED driving power, effective power, constant current accuracy, power source life, electromagnetic compatibility, design a good power supply and must consider these factors.LED is current mode device, but LED meeting evolution of heat in luminescence process cause operating current to change, and then affected colour developing and the life-span of LED, and constant current driving can improve this situation.Although present LED driver great majority have been constant currents, drive, but need specific power supply to power, increased volume and the cost of circuit.
And existing commercial LED drive circuit few in number also adopts the integrated circuit (IC) chip of price comparison costliness mostly, and can only be for the civil power input of the 220V of China, therefore application is also restricted.
Summary of the invention
In order to solve in existing LED constant-current drive technology, need particular power source to power, and drive circuit volume is large, high in cost of production problem, the invention provides a kind of voltage range is directly power supply of civil power, applied range, the efficiency commercial LED constant-current drive circuit high, simple in structure of 85V-256V.
In order to solve these problems of the prior art, the technical solution used in the present invention is:
A commercial LED constant-current drive circuit, comprises input and current rectifying and wave filtering circuit (1) and output circuit (4), it is characterized in that: also comprise ON-OFF control circuit (2) and constant current feedback control circuit (3); Described input is as the input of current rectifying and wave filtering circuit (1), the output of current rectifying and wave filtering circuit (1) is connected with the input of ON-OFF control circuit (2), and the output of ON-OFF control circuit (2) is connected with the input of constant current feedback control circuit (3), the output of constant current feedback control circuit (3) is connected with output circuit (4).
Aforesaid a kind of commercial LED constant-current drive circuit, is characterized in that: described input and current rectifying and wave filtering circuit (1) comprise civil power input AC, certainly recover fuse FU, capacitor C 1, capacitor C 6, common mode choke L2, rectifier bridge BR; One end of civil power input AC is connected with the one end of certainly recovering fuse FU, and the other end that certainly recovers fuse FU is connected with one end of capacitor C 6; Capacitor C 6 with certainly recover one end that fuse FU is connected and be connected with one end of common mode choke L2 input simultaneously, the other end of the capacitor C 6 simultaneously and other end of civil power input AC, the other end that common mode choke L2 inputs is connected; Two end points of common mode choke L2 output DE are connected with two inputs of rectifier bridge BR respectively; The positive electrode of rectifier bridge BR output is connected with the positive electrode of capacitor C 1, the positive input terminal of ON-OFF control circuit (2) simultaneously; The negative electrode of rectifier bridge BR output is connected with the negative electrode of capacitor C 1, the negative input end of ON-OFF control circuit (2) simultaneously.
Aforesaid a kind of commercial LED constant-current drive circuit, is characterized in that: described ON-OFF control circuit (2) comprises integrated circuit U1, Transient Voltage Suppressor DZ1, Ultrafast recovery diode D1, diode D3, capacitor C 4, capacitor C 5, capacitor C 7, resistance R 2 and the high frequency transformer that has 3 coils; The positive input terminal of ON-OFF control circuit (2) is connected with the positive electrode of Transient Voltage Suppressor DZ1,1 end of the primary coil L3 of high frequency transformer simultaneously; 2 ends of the primary coil L3 of high frequency transformer are connected with the drain lead D of integrated circuit U1; The source lead S of integrated circuit U1 simultaneously with the negative electrode of capacitor C 5, the negative output terminal of 4 ends, input and the current rectifying and wave filtering circuit (1) of the feedback winding L 4 of high frequency transformer be connected; The control pin C of integrated circuit U1 is connected with the positive electrode of capacitor C 5, the feedback output end of constant current feedback control circuit (3) simultaneously; 3 ends of the feedback winding L 4 of high frequency transformer are connected with the positive electrode of diode D3, the negative electrode of diode D3 is connected with an input of capacitor C 4, constant current feedback control circuit (3) simultaneously, the other end while of capacitor C 4 is connected with 4 ends of feedback winding L 4 of high frequency transformer, one end of capacitor C 7, and the other end while of capacitor C 7 is connected with 5 ends of secondary coil L5 of high frequency transformer, the negative input circuit end of constant current feedback control circuit (3); One end of resistance R 2 is connected with 4 ends of the feedback winding L 4 of high frequency transformer, and the other end is connected with 5 ends of the secondary coil L5 of high frequency transformer; 6 ends of the secondary coil L5 of high frequency transformer are connected with the positive input terminal of constant current feedback control circuit (3).
Aforesaid a kind of commercial LED constant-current drive circuit, it is characterized in that: described constant current feedback control circuit (3) comprises diode D2, inductance L 1, optical coupler U2, triode Q1, triode Q2, capacitor C 2, capacitor C 8, resistance R 1, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7; The positive output of ON-OFF control circuit (2) is connected with the positive electrode of diode D2, the negative output terminal of ON-OFF control circuit (2) is connected with the negative electrode of capacitor C 2, one end of the emitter of triode Q1, resistance R 3 simultaneously, the negative electrode of diode D2 is connected with the positive electrode of capacitor C 2, one end of inductance L 1 simultaneously, the other end of inductance L 1 simultaneously with the positive input terminal of output circuit (4), one end of resistance R 5, resistance R 6 one end be connected; The other end of resistance R 5 is connected with the emitter of triode Q2, and the base stage of triode Q2 is connected with one end of resistance R 4, and the collector electrode of triode Q2 is connected with one end of resistance R 1, and the other end of resistance R 1 is connected with the anode of optical coupler U2; The other end of resistance R 6 is connected with the collector electrode of triode Q1, the positive electrode of the other end of resistance R 4, capacitor C 8 simultaneously, the base stage of triode Q1 is connected with the negative electrode of capacitor C 8, one end of resistance R 7 simultaneously, the other end of resistance R 7 simultaneously with the other end of resistance R 3, the negative input end of the negative electrode of optical coupler U2, output circuit (4) be connected; The collector electrode of optical coupler U2 is connected with an output of ON-OFF control circuit (2), and the emitter of optical coupler U2 is connected with the feedback input end of ON-OFF control circuit (2).
Aforesaid a kind of commercial LED constant-current drive circuit, it is characterized in that: described output circuit (4) comprises capacitor C 3, the positive electrode of capacitor C 3 is connected with positive output end, the output positive electrode of constant current feedback control circuit (3) simultaneously, and the negative electrode of capacitor C 3 is connected with negative output terminal, the output negative electrode of constant current feedback control circuit (3) simultaneously.
Aforesaid any one commercial LED constant-current drive circuit, is characterized in that: what described integrated circuit U1 adopted is TOPSwitch-II series.
The invention has the beneficial effects as follows: the present invention utilizes the directly mode of power supply of civil power, by ON-OFF control circuit and constant current feedback control circuit, provides precision high and adjustable constant current.And short circuit is provided, opens circuit and overload protection, improved the reliability of circuit.Circuit structure is simple, and volume is little, and cost is low, and input voltage range is wide, applied range.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of commercial LED constant-current drive circuit of the present invention;
Fig. 2 is commercial LED constant-current drive circuit module map of the present invention.
Embodiment
The present invention is further illustrated for the embodiment providing below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of commercial LED constant-current drive circuit, comprise input and current rectifying and wave filtering circuit 1, ON-OFF control circuit 2, constant current feedback control circuit 3 and output circuit 4, described input and current rectifying and wave filtering circuit 1, ON-OFF control circuit 2, constant current feedback control circuit 3 and output circuit 4 are electrically connected to successively.
In technique scheme, as shown in Figure 1, described input and current rectifying and wave filtering circuit comprise civil power input AC, certainly recover fuse FU, capacitor C 1, capacitor C 6, common mode choke L2, rectifier bridge BR.The electromagnetic interface filter filtering of civil power AC-input voltage through being comprised of capacitor C 6 and common mode choke L2, has filtered out the interference of the high-frequency impulse of extraneous electrical network to power supply, also plays and reduces Switching Power Supply electromagnetic interference to external world itself simultaneously.And then after the rectification of rectifier bridge BR and the filtering of input filter capacitor C1, obtain high direct voltage.When circuit is short-circuited or transships; from recovering fuse FU, be high-impedance state; electric current is by rapid pinch off; thereby circuit is carried out fast; limit accurately and protect, its small electric current makes fuse always in guard mode, after power-off and fault eliminating; from recovering fuse FU, revert to normal condition, without artificial replacing.
In technique scheme, as shown in Figure 1, described ON-OFF control circuit 2 comprises integrated circuit U1, Transient Voltage Suppressor DZ1, Ultrafast recovery diode D1, diode D2, capacitor C 4, capacitor C 5, capacitor C 7, resistance R 2 and the high frequency transformer that has 3 coils.High direct voltage UI, then by armature winding, connect the drain electrode of integrated circuit.The drain electrode clamping protection circuit consisting of DZ1 and D1, within the peak voltage that high frequency transformer leakage inductance is formed is limited to safe range.The output voltage of feedback winding is after D3, C4 rectifying and wave-filtering, and the feedback voltage obtaining provides bias voltage to phototriode.C5 is shunt capacitance, doubles as frequency compensation electric capacity and determines autoboot frequency.R2 is the dummy load of feedback winding, can the unlikely rising of limit feedback voltage when unloaded.
In technique scheme, as shown in Figure 1, described constant current feedback control circuit and output circuit comprise diode D2, inductance L 1, optical coupler U2, triode Q1, triode Q2, capacitor C 2, capacitor C 3, capacitor C 8, resistance R 1, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7.Triode Q1 and Q2, resistance R 3, optical coupler U2, resistance R 4～R7, capacitor C 8 have formed current regulator.Wherein, resistance R 3 is exclusively used in detection output current value.R6, R5 are respectively used to establish collector current value IC1, the IC2 of Q1, Q2, and R5 has also determined the DC current gain of current regulator.C8 is frequency compensation electric capacity, prevents that loop from producing self-oscillation.When just switching on or resetting automatically, transient peak voltage can make Q1 conducting, utilizes R7 to limit its emitter junction electric current; The effect of R4 is that the On current of Q1 is bypassed through Q2, makes it not pass through R1.C7 is safe electric capacity, the common mode disturbances that energy filtering is produced by primary and secondary coupling capacitance.
More than show and described basic principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; the content of describing in above-described embodiment and specification has just illustrated principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is by appending claims and equivalent circle thereof.
Claims (4)
1. a commercial LED constant-current drive circuit, comprises input and current rectifying and wave filtering circuit (1) and output circuit (4), it is characterized in that: also comprise ON-OFF control circuit (2) and constant current feedback control circuit (3); Described input is as the input of current rectifying and wave filtering circuit (1), the output of current rectifying and wave filtering circuit (1) is connected with the input of ON-OFF control circuit (2), and the output of ON-OFF control circuit (2) is connected with the input of constant current feedback control circuit (3), the output of constant current feedback control circuit (3) is connected with output circuit (4); Described input and current rectifying and wave filtering circuit (1) comprise civil power input AC, certainly recover fuse FU, capacitor C 1, capacitor C 6, common mode choke L2, rectifier bridge BR; One end of civil power input AC is connected with the one end of certainly recovering fuse FU, and the other end that certainly recovers fuse FU is connected with one end of capacitor C 6; Capacitor C 6 with certainly recover one end that fuse FU is connected and be connected with one end of common mode choke L2 input simultaneously, the other end of the capacitor C 6 simultaneously and other end of civil power input AC, the other end that common mode choke L2 inputs is connected; Two end points of common mode choke L2 output are connected with two inputs of rectifier bridge BR respectively; The positive electrode of rectifier bridge BR output is connected with the positive electrode of capacitor C 1, the positive input terminal of ON-OFF control circuit (2) simultaneously; The negative electrode of rectifier bridge BR output is connected with the negative electrode of capacitor C 1, the negative input end of ON-OFF control circuit (2) simultaneously; Described ON-OFF control circuit (2) comprises integrated circuit U1, Transient Voltage Suppressor DZ1, Ultrafast recovery diode D1, diode D3, capacitor C 4, capacitor C 5, capacitor C 7, resistance R 2 and the high frequency transformer that has 3 coils; The positive input terminal of ON-OFF control circuit (2) is connected with the positive electrode of Transient Voltage Suppressor DZ1,1 end of the primary coil L3 of high frequency transformer simultaneously; 2 ends of the primary coil L3 of high frequency transformer are connected with the drain lead D of integrated circuit U1; The source lead S of integrated circuit U1 simultaneously with the negative electrode of capacitor C 5, the negative output terminal of 4 ends, input and the current rectifying and wave filtering circuit (1) of the feedback winding L 4 of high frequency transformer be connected; The control pin C of integrated circuit U1 is connected with the positive electrode of capacitor C 5, the feedback output end of constant current feedback control circuit (3) simultaneously; 3 ends of the feedback winding L 4 of high frequency transformer are connected with the positive electrode of diode D3, the negative electrode while of diode D3 is connected with the collector electrode of the optical coupler U2 in capacitor C 4, constant current feedback control circuit (3), the other end while of capacitor C 4 is connected with 4 ends of feedback winding L 4 of high frequency transformer, one end of capacitor C 7, and the other end while of capacitor C 7 is connected with 5 ends of secondary coil L5 of high frequency transformer, the negative input circuit end of constant current feedback control circuit (3); One end of resistance R 2 is connected with 4 ends of the feedback winding L 4 of high frequency transformer, and the other end is connected with 5 ends of the secondary coil L5 of high frequency transformer; 6 ends of the secondary coil L5 of high frequency transformer are connected with the positive input terminal of constant current feedback control circuit (3).
2. a kind of commercial LED constant-current drive circuit according to claim 1, it is characterized in that: described constant current feedback control circuit (3) comprises diode D2, inductance L 1, optical coupler U2, triode Q1, triode Q2, capacitor C 2, capacitor C 8, resistance R 1, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7; The positive output of ON-OFF control circuit (2) is connected with the positive electrode of diode D2, the negative output terminal of ON-OFF control circuit (2) is connected with the negative electrode of capacitor C 2, one end of the emitter of triode Q1, resistance R 3 simultaneously, the negative electrode of diode D2 is connected with the positive electrode of capacitor C 2, one end of inductance L 1 simultaneously, the other end of inductance L 1 simultaneously with the positive input terminal of output circuit (4), one end of resistance R 5, resistance R 6 one end be connected; The other end of resistance R 5 is connected with the emitter of triode Q2, and the base stage of triode Q2 is connected with one end of resistance R 4, and the collector electrode of triode Q2 is connected with one end of resistance R 1, and the other end of resistance R 1 is connected with the anode of optical coupler U2; The other end of resistance R 6 is connected with the collector electrode of triode Q1, the positive electrode of the other end of resistance R 4, capacitor C 8 simultaneously, the base stage of triode Q1 is connected with the negative electrode of capacitor C 8, one end of resistance R 7 simultaneously, the other end of resistance R 7 simultaneously with the other end of resistance R 3, the negative input end of the negative electrode of optical coupler U2, output circuit (4) be connected; One end of the negative electrode of the collector electrode of optical coupler U2 and diode D3 in ON-OFF control circuit (2) and the capacitor C 4 being connected with diode D3 negative electrode is connected, and the emitter of optical coupler U2 is connected with the feedback input end of ON-OFF control circuit (2).
3. a kind of commercial LED constant-current drive circuit according to claim 2, it is characterized in that: described output circuit (4) comprises capacitor C 3, the positive electrode of capacitor C 3 is connected with positive output end, the output positive electrode of constant current feedback control circuit (3) simultaneously, and the negative electrode of capacitor C 3 is connected with negative output terminal, the output negative electrode of constant current feedback control circuit (3) simultaneously.
4. a kind of commercial LED constant-current drive circuit according to claim 1, is characterized in that: what described integrated circuit U1 adopted is TOPSwitch-II series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110116198.6A CN102281669B (en) | 2011-05-06 | 2011-05-06 | Mains supply light-emitting diode (LED) constant current driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110116198.6A CN102281669B (en) | 2011-05-06 | 2011-05-06 | Mains supply light-emitting diode (LED) constant current driving circuit |
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| CN102281669A CN102281669A (en) | 2011-12-14 |
| CN102281669B true CN102281669B (en) | 2014-02-26 |
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| CN109342922B (en) * | 2018-10-11 | 2021-09-14 | 苏州耀腾光电有限公司 | Open and short circuit integrated detection circuit in constant current circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221450A (en) * | 2007-12-04 | 2008-07-16 | 南京大学 | Constant temperature equipment for instrument |
| CN101742783A (en) * | 2010-01-21 | 2010-06-16 | 海洋王照明科技股份有限公司 | High power LED drive circuit with emergency function |
| CN101765274A (en) * | 2010-01-29 | 2010-06-30 | 海洋王照明科技股份有限公司 | LED lamp and drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040004446A1 (en) * | 2002-07-05 | 2004-01-08 | Hun-Huang Liu | Drive circuit for an led lighting apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221450A (en) * | 2007-12-04 | 2008-07-16 | 南京大学 | Constant temperature equipment for instrument |
| CN101742783A (en) * | 2010-01-21 | 2010-06-16 | 海洋王照明科技股份有限公司 | High power LED drive circuit with emergency function |
| CN101765274A (en) * | 2010-01-29 | 2010-06-30 | 海洋王照明科技股份有限公司 | LED lamp and drive circuit |
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